User Panel
User Panel
User Panel
AZ, USA
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Posted: 7/24/2024 8:25:08 PM EDT
I'm trying to figure out what it would take to run 50amp @ 240vac for 300feet, but the calculators I'm finding online don't seem to like these numbers. Can anyone tell me what it would take?
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Posted: 7/24/2024 8:43:56 PM EDT
[#1]
OST. I tried to do this many years ago but the answers gave me "2 gauge wire'' or some such.
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Posted: 7/24/2024 8:56:59 PM EDT
[#2]
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SD, USA
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Posted: 7/24/2024 8:57:18 PM EDT
[Last Edit: voodoocustomz]
[#3]
I come up with #3 copper, or 1/0 aluminum.
ETA 1 conductor per phase utilizing a 3 AWG copper conductor installed Cable, Conduit (non-Steel), & Direct Burial will limit the voltage drop to 2.93% or less when supplying 50 amps for 300 feet on a 240 volt single phase system. Engineering Information 85Amps Rated ampacity of selected conductor 0.2379Ohms Resistance (Ohms per 1000 feet) 0.0470Ohms Reactance (Ohms per 1000 feet) 0.9Power Factor 7.20Maximum allowable voltage drop at 3% 7.038Actual voltage drop loss at 2.93% for the circuit |
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Posted: 7/24/2024 9:59:29 PM EDT
[#4]
Pretty good haul for 50a. What exactly is the load? Motor, sub panel?
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AZ, USA
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Posted: 7/24/2024 10:30:43 PM EDT
[#5]
Quote HistoryOriginally Posted By DVCER: Pretty good haul for 50a. What exactly is the load? Motor, sub panel? Sub panel. Two RVs, an air conditioner, and lights. |
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AZ, USA
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Posted: 7/25/2024 2:45:07 PM EDT
[#6]
Quote HistoryOriginally Posted By voodoocustomz: I come up with #3 copper, or 1/0 aluminum. ETA 1 conductor per phase utilizing a 3 AWG copper conductor installed Cable, Conduit (non-Steel), & Direct Burial will limit the voltage drop to 2.93% or less when supplying 50 amps for 300 feet on a 240 volt single phase system. Engineering Information 85Amps Rated ampacity of selected conductor 0.2379Ohms Resistance (Ohms per 1000 feet) 0.0470Ohms Reactance (Ohms per 1000 feet) 0.9Power Factor 7.20Maximum allowable voltage drop at 3% 7.038Actual voltage drop loss at 2.93% for the circuit Great info. And then I'd want the same size for the neutral since I'll be drawing rather high current on 120volt. How do I size the ground? |
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Posted: 7/25/2024 7:02:30 PM EDT
[Last Edit: zeekh]
[#7]
Quote HistoryOriginally Posted By Imzadi: Great info. And then I'd want the same size for the neutral since I'll be drawing rather high current on 120volt. How do I size the ground? Not an electrician, AFAIK, ground can be 2 sizes smaller than feed wires. |
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Posted: 7/29/2024 7:16:47 PM EDT
[#8]
Quote HistoryOriginally Posted By Imzadi: Great info. And then I'd want the same size for the neutral since I'll be drawing rather high current on 120volt. How do I size the ground? You just want a quadplex wire which will come with a smaller ground. It might be cheaper to get another pole and service installed. |
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WA, USA
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Posted: 7/30/2024 2:15:22 PM EDT
[#9]
Quote HistoryOriginally Posted By zeekh: Not an electrician, AFAIK, ground can be 2 sizes smaller than feed wires. You’re thinking neutral/grounded conductor. Op, your ground is based going to be based on the size of breaker protecting the circuit. It doesn’t have to be resized for voltage drop like grounded conductors. For a 50a circuit it’s 10ga copper for ground. |
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Posted: 7/30/2024 2:19:19 PM EDT
[#10]
Quote HistoryOriginally Posted By Imzadi: Sub panel. Two RVs, an air conditioner, and lights. Quote HistoryOriginally Posted By Imzadi: Originally Posted By DVCER: Pretty good haul for 50a. What exactly is the load? Motor, sub panel? Sub panel. Two RVs, an air conditioner, and lights. You are going to power TWO RV's, and another A/C unit, on 50 amps? |
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Posted: 7/30/2024 2:31:59 PM EDT
[#11]
I always thought the most affordable is mobile home service entrance wire, like 2-2-2-4 AL.
https://www.lowes.com/pd/Southwire-2-2-2-4-Black-Stranded-Al-MHF-Use-2-Cable/5002300757 I don't think 2 is big enough tho. https://paigeconnected.com/calculators/wiresize-calculator https://www.southwire.com/calculator-vdrop |
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Posted: 7/30/2024 2:37:13 PM EDT
[Last Edit: diamondd817]
[#12]
6 gauge, or 4 gauge if you really want to overcompensate.
4/3 with ground. |
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Posted: 7/30/2024 2:43:36 PM EDT
[#13]
Quote HistoryOriginally Posted By diamondd817: 6 gauge, or 4 gauge if you really want to overcompensate. 4/3 with ground. What constitutes an acceptable voltage drop to you? |
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Posted: 7/31/2024 5:27:45 PM EDT
[#14]
Quote HistoryOriginally Posted By lethe: You’re thinking neutral/grounded conductor. Op, your ground is based going to be based on the size of breaker protecting the circuit. It doesn’t have to be resized for voltage drop like grounded conductors. For a 50a circuit it’s 10ga copper for ground. Quote HistoryOriginally Posted By lethe: Originally Posted By zeekh: Not an electrician, AFAIK, ground can be 2 sizes smaller than feed wires. You’re thinking neutral/grounded conductor. Op, your ground is based going to be based on the size of breaker protecting the circuit. It doesn’t have to be resized for voltage drop like grounded conductors. For a 50a circuit it’s 10ga copper for ground. Separate neutral and grounds in a sub panel. Ground back to main panel can be 2 sizes smaller. Neutral same size as hot wires. |
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WA, USA
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Posted: 7/31/2024 7:09:37 PM EDT
[#15]
Quote HistoryOriginally Posted By zeekh: Separate neutral and grounds in a sub panel. Ground back to main panel can be 2 sizes smaller. Neutral same size as hot wires. Where are you getting that a ground can be 2 sizes smaller. It’s based on your ocpd size, not the size of your “hot” wires. |
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Posted: 7/31/2024 7:35:06 PM EDT
[#16]
Quote HistoryOriginally Posted By lethe: Where are you getting that a ground can be 2 sizes smaller. It’s based on your ocpd size, not the size of your “hot” wires. Quote HistoryOriginally Posted By lethe: Originally Posted By zeekh: Separate neutral and grounds in a sub panel. Ground back to main panel can be 2 sizes smaller. Neutral same size as hot wires. Where are you getting that a ground can be 2 sizes smaller. It’s based on your ocpd size, not the size of your “hot” wires. Unsure what ocpd size is. I used #2 copper wire for 2 hots and a neutral from main panel to sub panel. #4 copper wire for ground from main panel to sub panel. Had my subpage inspected, it passed. Also had have ground rod at the sub panel. |
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Posted: 7/31/2024 7:48:13 PM EDT
[#17]
Quote HistoryOriginally Posted By zeekh: Unsure what ocpd size is. I used #2 copper wire for 2 hots and a neutral from main panel to sub panel. #4 copper wire for ground from main panel to sub panel. Had my subpage inspected, it passed. Also had have ground rod at the sub panel. Quote HistoryOriginally Posted By zeekh: Originally Posted By lethe: Originally Posted By zeekh: Separate neutral and grounds in a sub panel. Ground back to main panel can be 2 sizes smaller. Neutral same size as hot wires. Where are you getting that a ground can be 2 sizes smaller. It’s based on your ocpd size, not the size of your “hot” wires. Unsure what ocpd size is. I used #2 copper wire for 2 hots and a neutral from main panel to sub panel. #4 copper wire for ground from main panel to sub panel. Had my subpage inspected, it passed. Also had have ground rod at the sub panel. OCPD = overcurrent protection device. The amperage rating of the breaker for the sub panel, will determine the minimum grounding conductor wire size. |
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Posted: 7/31/2024 7:52:17 PM EDT
[#18]
Quote HistoryOriginally Posted By FALARAK: What constitutes an acceptable voltage drop to you? In the real world, 1,000 ft or more. |
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Posted: 7/31/2024 8:02:40 PM EDT
[#19]
Quote HistoryOriginally Posted By diamondd817: In the real world, 1,000 ft or more. Quote HistoryOriginally Posted By diamondd817: Originally Posted By FALARAK: What constitutes an acceptable voltage drop to you? In the real world, 1,000 ft or more. 5% |
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WA, USA
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Posted: 7/31/2024 10:06:34 PM EDT
[#20]
Quote HistoryOriginally Posted By zeekh: Unsure what ocpd size is. I used #2 copper wire for 2 hots and a neutral from main panel to sub panel. #4 copper wire for ground from main panel to sub panel. Had my subpage inspected, it passed. Also had have ground rod at the sub panel. You way oversized your ground. Nothing wrong with it being oversized but saying you can go two sizes smaller than the ungrounded conductors (hot) is going to get someone to fail an inspection. In some cases grounded conductors (neutrals) can be sized two sizes smaller than ungrounded conductors but that’s not the case at all for the grounding conductor. |
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Posted: 8/1/2024 5:12:21 AM EDT
[#21]
Quote HistoryOriginally Posted By lethe: Where are you getting that a ground can be 2 sizes smaller. It’s based on your ocpd size, not the size of your “hot” wires. Quote HistoryOriginally Posted By lethe: Originally Posted By zeekh: Separate neutral and grounds in a sub panel. Ground back to main panel can be 2 sizes smaller. Neutral same size as hot wires. Where are you getting that a ground can be 2 sizes smaller. It’s based on your ocpd size, not the size of your “hot” wires. Your ocpd is based on ampacity of your wire correct? |
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Posted: 8/1/2024 6:42:13 AM EDT
[#22]
Quote HistoryOriginally Posted By lethe: You’re thinking neutral/grounded conductor. Op, your ground is based going to be based on the size of breaker protecting the circuit. It doesn’t have to be resized for voltage drop like grounded conductors. For a 50a circuit it’s 10ga copper for ground. 250.122(B) would disagree. |
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Posted: 8/7/2024 9:44:26 PM EDT
[#23]
300' I would run #4 copper
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Posted: 8/9/2024 7:46:02 PM EDT
[#24]
Quote HistoryOriginally Posted By zeekh: Separate neutral and grounds in a sub panel. Ground back to main panel can be 2 sizes smaller. Neutral same size as hot wires. HUGE. Neutral and ground MUST be separate on a sub panel. They can only be bonded at the main unless you want problems. |
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